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GeographyClass 7All

How many types of plate movements are there?

Ans. There are 2 types of plate movement: convergence and divergence.

GeographyClass 7All

What are the effects of earthquake on the landform?

The earthquake does not crate any major landform. They can however cause changes to the existing landforms. For e.g., it may cause cracks to the buildings.

GeographyClass 7All

What do you understand by volcanic cone?

Ans. During a volcanic eruption, gases, ash, steam and pieces of rocks are spewed out. Gradually, these and solidified lava pile around the vent, forming a conical hill known as volcanic cone.

GeographyClass 7All

Define tectonic processes?

Landform building processes like folding, faulting etc. caused by the movement of the lithosphere plates.

GeographyClass 7All

Why is action of wind more prominent in arid and semi arid regions?

Ans The action of wind is more prominent in arid and semi arid areas due to several reasons. The wind is dry and light; hence, blows at a greater speed. Because of greater speed, it has more velocity to erode and carry away more material. Lack of trees in this region means there are less barriers to the flow of winds. Dry soil is loose and in the absence of vegetation to hold it down it is easily carried away

GeographyClass 7All

Name any 3 lagoons of India?

Ans. The three lagoons are: Lake Chilka. Lake Pulicat. I Lake Kolleru.

GeographyClass 7All

What is marine erosion?

The erosion of coastal land by the sea is called marine erosion.

GeographyClass 7All

How is an earthquake measured?

Ans. An earthquake is measured with a machine called a seismograph. The magnitude of the earthquake is measured on the Richter scale. An earthquake of 2.0 or less can be felt only a little. An earthquake over 5.0 can cause damage from things falling. A 6.0 or higher magnitude is considered very strong and 7.0 is classified as a major earthquake.

GeographyClass 7All

What preparedness measures should be adopted during an earthquake?

Ans Earthquake preparedness measures: Safe Spot: Under a kitchen counter, table or desk, against an inside corner or wall. Stay Away from: Fire places, areas around chimneys, windows that shatters including mirrors and picture frames. Be Prepared: Spread awareness amongst your friends and family members and face any disaster confidently.

GeographyClass 7All

Define the following terms: weathering, denudation and erosion?

Ans. The combined action of all processes that involve only the breaking down of the rocks is known as weathering. The combined action of transportation and breaking down of rocks is known as erosion. The laying bare of underlying rocks as a result of weathering, mass movement and erosion is known as denudation.

GeographyClass 7All

Define water budget.

Ans Water budget is the budget of water based on water available. In this, water gained through precipitation, melting of ice etc. is like income and water lost through transpiration, evaporation etc. is expenditure. When more water is gained, the water budget shows surplus, when more water is lost the budget shows deficit.

GeographyClass 7All

How does an ocean current influence the rainfall distribution?

Ans Winds passing over the warm currents pick up the moisture and cause heavy rainfall, for e.g., eastern USA and western coast of Europe. Whereas the winds blowing over cold currents become cool and dry and bring hardly any rainfall. Therefore, deserts are found here.

GeographyClass 7All

Give the movement of warm current.

Ans The warm currents generally move from tropical region to higher latitudes.

GeographyClass 7All

How are waves formed?

Ans The action of winds causes disturbances on the surface of water. When the wind blows over the ocean surface, it pushes down the particles of water. Each particle is pushed down and it comes again, so it moves in a circular path. As the particles are closely packed so the motion is passed to the next. So, the particles do not move, only the motion is transferred.

GeographyClass 7All

Give 2 disadvantages of ocean currents.

Ans The ocean currents has both advantages and disadvantages. The disadvantages are: Warm current melt icebergs which is dangerous for the ships. Thick fog occurs where warm & cold current meet, hence reducing the visibility.

GeographyClass 7All

In which general direction do ocean currents move in Northern and Southern hemisphere?

Ans The ocean currents move in clockwise direction in Northern hemisphere and anticlockwise direction in southern direction.

GeographyClass 7All

Why does harbour of London not freezes in winters?

Ans The saline water of sea freezes at a lower temperature than river water does. The sea water rushing in during the high tide prevents the London harbour from freezing.

GeographyClass 7All

What caused tsunami in Indian Ocean in December 2004? Which regions were most affected?

Ans Tsunami of 2004 originated near Sumatra, where the Indian plate slides under the Eurasian plate. This lasted for 10 minutes. The region most affected were the coasts of Indonesia, South India, Sri Lanka and Thailand.

GeographyClass 7All

What are drifts?

Ans. Slow moving masses of water in the ocean are called ‘drifts’. Often, as ocean current moves away from its origin, it becomes a ‘drift’.

GeographyClass 7All

Where are the best fishing grounds of the world found?

Ans. The areas where the warm and cold currents meet, i.e., seas around Japan and the eastern coast of North America.

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